Bump ubuntu from 20.04 to 22.04 in /.ci/docker-ci/ubuntu (#853)

Bumps ubuntu from 20.04 to 22.04.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.ci/docker-ci/ubuntu/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 LABEL maintainer="mail@sobolevn.me"
 LABEL vendor="git-secret team"